The CAS Registry Mumber 156567-10-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,6,5,6 and 7 respectively; the second part has 2 digits, 1 and 0 respectively. Calculate Digit Verification of CAS Registry Number 156567-10: (8*1)+(7*5)+(6*6)+(5*5)+(4*6)+(3*7)+(2*1)+(1*0)=151 151 % 10 = 1 So 156567-10-1 is a valid CAS Registry Number.
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